Yeah, I was kind of leaning towards at least being able to move your normal speed. And I didn't mean to ask if this could be combined with a charge, was merely using an example of how with a charge (which is a full round action) you can still double move.
I did not copy the entire feat, but it states that after you attack, you move out of your foe's square(s) back into whichever square you just left. So whether or not you can stay there and keep attack is moot. Though if you want to do that, there is the Underfoot Combat + Confound the Big Folk feats from Races of the Wild.